aFe Power Twisted Steel Header | 2004-2016 Subaru WRX STI (48-36802)

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Steel Header for Subaru WRX STI H4-2.5L

These headers are constructed of near equal length mandrel-bent 1-5/8-inch into 2-1/2-inch 16-gauge, 304 stainless steel tubing and uses 3/8-inch thick flanges for strength and to ensure a leak-free seal. The smooth curves and increased diameter of this header helps remove restriction and keeps exhaust gas flowing smoothly for improved performance and durability. To eliminate dead space that can cause turbulence and hinder flow, a 4-to-1 formed collector and optimized tube lengths are used. This combination helps increase exhaust velocity improving flow, as well as horsepower and torque improving throttle response. This system retains factory mounting locations and requires no modification for a simple, hassle-free installation.